code: def testEmpty(self):
      freqs = []
      mags = []
      self.assertEqualVector(Tristimulus()([], []), [0, 0, 0])
  
file_path: essentia/test/src/unittests/tonal/test_tristimulus.py
imports: from essentia_test import *
label_desc: Use image node_id 7 for calling the TestTristimulus obj's underlying member method code with example usage: obj.testEmpty() without return types